To the best of my knowledge, all front sight blades on all DW's interchange. The factory has them for just a few bucks.
They can be contacted at:
Corporate Office:
Dan Wesson Corp.
5169 Highway 12 South
Norwich, NY. 13815
Telephone: (607) 336-1174
Fax: (607) 336-2730
Send email: info@danwessonfirearms.com
Sales Request: gunsales@danwessonfirearms.com